/Engine/Source/Editor/Experimental/EditorInteractiveToolsFramework/Public/Behaviors/2DViewportBehaviorTargets.h
IClickDragBehaviorTarget.
virtual [FInputRayHit](API\Runtime\InteractiveToolsFramework\FInputRayHit) CanBeginClickDragSequence ( const [FInputDeviceRay](API\Runtime\InteractiveToolsFramework\FInputDeviceRay) & PressPos )